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Home Product Model 5/16-18x3-1/2 3.5" Stainless Hex Bolt, UNF Coarse Thread, Heavy-Duty Fastener, Construction Grade
US hexagon socket head cap 5/16-18*3-1/2

Model 5/16-18x3-1/2 3.5" Stainless Hex Bolt, UNF Coarse Thread, Heavy-Duty Fastener, Construction Grade

5/16-18 hex bolts
3-1/2 machine screws
UNC threaded rods
5/16-18*3-1/2
5/16-18 Hex bolts, 3-1/2 inches long machine screws with UNC threaded rods for secure fastening applications.
Categories:Fasteners & Fixings
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Product Description

The 5/16-18 hex bolts are UNC threaded rods designed for industrial fastening applications, featuring a diameter of 5/16", 18 threads per inch (TPI), and a length of 3-1/2 inches. These Grade 8 hardened steel machine screws comply with ANSI/ASME B18.2.1 standards, supporting tensile strength up to 150,000 PSI. Ideal for heavy machinery assembly, automotive systems, and construction frameworks, they operate reliably within -40°F to 250°F environments. Zinc-plated finish enhances corrosion resistance in humid conditions. The hexagonal head enables secure torque application with standard 1/2" wrenches. Limitations include reduced compatibility with metric components and thermal expansion considerations beyond 250°F. Typical applications demand pre-drilled 0.3125" clearance holes for precise installation. These UNC-threaded fasteners provide superior shear resistance but require periodic lubrication in high-vibration settings.
Parameter Specification
Nominal Diameter 5/16 inch
Threads Per Inch 18 TPI (UNC)
Length 3-1/2 inches
Thread Type Unified National Coarse (UNC)
Head Style Hexagonal
Drive Type Hex
Material Grade ASTM A307 Grade B
Surface Finish Zinc Plated
Tensile Strength 60,000 PSI
Thread Engagement Full Length
question:Why can other suppliers find discontinued models when you can't provide prices?
answer:Some suppliers use second-hand or surplus stock, risking quality. We prioritize reliable sources for guaranteed products.
question:Why are product labels cut off upon receipt?
answer:Labels may be removed due to legal, safety, or contractual requirements to comply with regional regulations.
question:Why are shipping costs high? Are there cheaper options?
answer:Express shipping incurs premium fees. We offer cost-effective alternatives like sea/land freight upon request.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
question:Why can other suppliers find discontinued models when you can't provide prices?
answer:Some suppliers use second-hand or surplus stock, risking quality. We prioritize reliable sources for guaranteed products.
question:Why are product labels cut off upon receipt?
answer:Labels may be removed due to legal, safety, or contractual requirements to comply with regional regulations.
question:Why are shipping costs high? Are there cheaper options?
answer:Express shipping incurs premium fees. We offer cost-effective alternatives like sea/land freight upon request.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
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